dry reef saver rock

I tried the trick of dividing the tank into thirds and came up with this. I really like the pillar looks. Since I’m going bare bottom but I love the look of sand, I used Krylon Stone Texture spray paint under the tank to make a fake sand bed Thoughts?

Hi, I just returned from my LFS. I have a Biocube 29 with 25 lbs of dry reef saver rock, live sand, dosed Seachem Stability first 7 days and feeding tank with fish flakes. (This is only Day 21 of tank cycle) LFS told me my dry rock is useless and I need 30 lbs of the live rock they sell...